Pulley-molding machine



(No Model.) 3 Sheets-Sheet 1. J. E. DGNOVAN.

PULLEY MOLDING MAGHINE.

No. 593,645. Patented Novn 16,1897.

3 Sheets-'Sheet 2.

J.E.D0N0VAN. PULLEY MOLDING MACHINE;

Patented Nov, 1.6', 1897.

1m; mams Evans co. Puo-murwq. WASHING-rum u c.

3 Sheets-'Sheet 3.

(No Model.)

. J.E.DONOVAN.

. PULLEY'MOLDING MACHINE. A No. 593,645. Patented Nov. 16,1897.

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- JOHN E. DONOVAN, or CINCINNATI, OHIO.

PULLEY-MOLDING MACHINE.

SPECIFICATION forming part of Letters Patent No.l 593,645, dated November 16, V1897'.

Application led April 1,7, 1895A.4 Serial No. 546,162. (No model.)

To all whom, pt/may concern.-`

Beit known that I, JOHN E. DONOVAN, a citizen. of the United States, and a resident of Cincinnati,'in the county of Hamilton'and 5 State of Ohio, have invented certain new and useful Improvements in Pulley-Molding Machines, of which the followingis a specification. Y

My invention relates to machines for mold- Io` ing pulleys; Its object is toprovide a machine to rapidly and accurately form molds for pulleys of different sizes, different Widths of rim and length of hub,'as may be desired. These objects I attain by the means illustrated i in the accompanying drawings, in connection with which the invention willbe first fully described and then particularly referred to and pointed out in the claims.V

Referring 'to the drawings, in lwhich like parts are indicated by similar reference-letters wherever they occur throughout the varions views, Figure l is a vertical diametrical section of myv improved machine with the hub and rim patterns in the elevated position for molding a pulley the hub of which is equal in length to the width of the pulley-face, thisview being taken through line z ,z of Fig. 4. Fig. 2 is a detailed view illustrating the means for connecting the rim andA hub followers. Fig. 3 is a detailed view of the means for vertically adjusting the hub-pattern with rela tion to the rim. Fig. 4 is a View, partly in plan and partly in transverse section, taken through line x of Fig. 1, some portions of the plan view being broken away to expose the parts below and the rim of the top severed by the section-line removed. Fig. 5 is a detailed view of the gearing by which the rim and the hub followers are simultaneously elevated and lowered. Fig. 6 is a view in side elevation of the machine with one of the supporting-columns omitted and some of the fixed parts broken away to more clearly eX- pose the means for adjusting the hub-fol- 4 5 lower. In this view the huband rim patterns occupy their lowest positions, as when withdrawn from the mold.

The stationary frame of the machine consists ofthe base A, the central tubular column 5o. A', the outer upright box-columns A2, secured thereon, and the outer rim of the table or follower-board'B, secured upon the columns A2.

tion has also an annular depression extendingv from the base of the central column to the bases of the upright columns, the purposeof which is to lessen machine-work indressing off the' upper surface of thebase to seat-the central and outer columns. The ends of the central and outer columns are also dressed off true, as isalso the under surface of the annular rim B, to form close-fitting joints, so that whenthe parts are fitted together they are practically as rigid as if 'cast integral or in a single piece.

Thecenter column A' has an outwardly- .projecting iiange which is vbolted to, theV base,

and the inner circumference of the column also fits around the upwardly-projecting.

flange of the central portion a' ofv the base. The bases of the uprights A2 have'also outwardly-projecting perforated iianges a2 to re'- ceive the screw-bolts by which the columns are fastened to the base, and the upper rim B is screwed or bolted securelyto the upper webs or anges of the columns A2. The top or follower-board of the table, inside of the rim B, is formed of a series of annular rings, the outer one, b, resting in an annular recess or rabbet in the rim B. The disk or ring b immediately within this one rests with its inner edge upon top of the column A', leaving a space between the two to receive the half-rim pattern C. The disk or ring b2 within this one also rests on the column A', and its .inner diameter has an inwardly-projecting annular iiange h3, upon which is seated the inner ring b4 of the follower-board, through which ring the hub-pattern D slides.

Withineach of the upright columnsl A2, of which there are four, as shown, isv iitted to revolve a screwshaft E, upon which shafts are nuts E'. These nuts have inwardly-proj ectin g brackets terminating in annular webs c,which are secured by bolts or other suitable means to the rim-follower F, which is fitted to slide vertically outside the column A'. Upon the upper ends of the shafts E are secured pinions E2,which mesh with the annular rack G,which is seated in an offsetin the IOO inner and downwardly-projecting flange of the outer rim B and held in place by a ring g, which is secured to the bottom edge of the inner flange of rim B.

One of the uprights A2 has projecting from it a tubular boss or bearing a2, wit-hin which is journaled a crank-shaft H, upon the inner end of which is secured a bevel-gea1'7t,\vhich meshes with a bevel-gear 7i upon a vertical shaft h2, which has its bearings in the upper flange of the upright A2 and the bracket a4, which projects inwardly from the outer wall of the column. p Upon this same shaft h2 is also secured a pinion h2, which meshes with the annular rack G. By placing a crank upon the angular end of the crank-shaft H and revolving it motion is imparted to the annular rack G and through it to the screw-shafts E. By this means the rim-follower F is elevated or lowered as the crank-shaft is turned in one or the other direction and the rim-pattern C elevated to the position shown in Fig. 1, or retracted after the mold is formed, as shown in Fig. 6.

The tubular hub-carrier I is fitted to slide within a hub J, which has outwardly-projectingarmsj, which project through vertical slots in the central column A. The ends of the arms are secured to the downwardly-projecting inner flange fof the rim-carrier, in order that the hub J and the rim-carrier will move up and down simultaneously when the rim-carrier is actuated by the gearing set in motion by the crank-shaft H, before described.

The hub-carrier I is formed with an inwardly-projecting rib t', which is exteriorly slotted to seat a rack I', which is secured within the slot by screw-bolts or other suitable means, and the hub J has projecting from it a perforated boss j .to furnish the inner bearing for the shaft K, upon the inner end of which is secured a pinion 7c, which engages the teeth of the rack l' for the purpose of adjusting the hub-carrier up and down within the hub J. The outer end of the shaft K has its bearing in a hanger K', which is secured to the rim-follower F. The outer end of the hanger has a circular disk 7o', the face of which is planed off true to eugage a similar disk 7a2, which projects from the hub of the hand-wheel K2, which is splined upon the outer end of the shaft K, so that it mayhave longitudinal motion upon said shaft.

The outer end of l[he shaft K is screwthreaded to receive the screw-threaded handwheel K2, by which the friction-surfaces of the disks 7c and 7.32 are locked together or released. In order to adjust the hub-pattern relative to the rim-pattern, the screw-nut K3 is tul'ned back, the shaft K revolved in either direction until the hub-pattern is brought to the proper relative position with the rim-pat tern, when the nut K3 is again tightened up, locking the hub-carrier rigidly to the hub J.

The upper ends of the screw-shaftsE have their bearings in the inwardly-projecting upper webs of the columns A2. The lower ends of these shafts are turned down, as clearly shown upon the right-hand side of Fig. l, to pass through halved boxes e, Han ged boxes e, and steps e2, the latter of which are secured rigidly upon the base of columns A2.- Within the box e is a steel disk having a V-shaped annular groove around it to receive the ballbearings e2, which rest upon a steel washer e, supported upon the step e2. The halved boxes e arel clamped rigidly upon the reduced end of the screw-shafts by bolts passing through their outwardly-projecting lugs, and the flanged boxes e are also secured to the shaft by set-screws e5. The purpose of this arrangement is to reduce friction, and the downwardly-projecting flange of the box e' prevents dust or sand from getting into the ballbearings.

The upper end of the shaft E is axially perforated, the perforations registering with a hole in the rim B, which is stopped by a screw-plug e6. There are also transverse perforations in the screw-shaft registering with the axial perforations. The purpose of this arrangement is to lubricate the screw and nut, which is done by removing the plugs e6. The outer rim B has also a downwardly-extending flange ?)5 for strength and also to prevent sand and other material working underneath and into the gearing. The interior rings of the follower-board have notches to receive registering keys in order to hold the parts in proper position, so that the divided arm-patterns M and the root of the arm-patterns M may always register truly with each other when the rim and arm patterns are changed.

The hnb-pattern I) is a plain hollow cylinder, in the lower end of which is secured a bottom d, the upper end being closed by a dan ged cap C Z'. The upper cap has a central tube (Z2 extending down from it to receive the core d5, which forms the bore of the hub. The lower fixed bottom d of the hub has a screw-threaded central extension to enter a tapped perforation in the top of the hub-carrier I, by which the hub-pattern is held firmly in place. The core (l5 is supported upon a rod d, the lower end of which is secured in the hub of the spider d2, the arms of which spider are secured to the flange surrounding the central base-openin g a'. The rod d extends through a central perforation in the bottom (l of the hub-pattern. rlhe upper end of rod d is provided with a removable cap d2 to form a seat for the core. The core, which is baked, slips freely through the downward extension d2, and after the mold is formed and the flask removed the core will be lifted with the sand mold, in which it is firmly embedded.

The purpose of adjusting the bottom end of the core slightly below the level of the follower-board is to insure a close fit of the'two half-cores when the flasks are put together, the Weight of the cope pressing one or other of the half-core patterns slightly into the sand.

IIO

To mold pulleys of different-sized bores, it is only necessary to change the upper cap d and substitute another onewith a larger or smaller central tube, as d2.

Upon one side of the hub-pattern is adjustably secured, as shown in Fig. 1, the bosspattern d3 by a screw or pin passing through a perforation in its upper end and into the wall of the hub-pattern. This boss-pattern is used when tight pulleys that require setscrews to hold them in position are to be molded.

When a pulley-hub requiring no boss is to be molded, the pin in the upper end of the 1 boss pattern is removed and the pattern dropped down on a level with the top of fillet or ring m,.which forms the edge finish of the root-piece of the arms M'. The root M of the arms is secured upon the inner ring b4 of the follower-board, and the purpose of the collar or fillet m, which is removably fitted vbetween the hub-pattern and root of the arms, is to enable me to place different diameters of hub-patternswith the same or different rim-pattern. It' the hub-pattern is required to be of a greater or less diameter, a wider or narrower fillet or ring is employed. The root of the arms M is'removably secured upon the central ring b4 of the followerboard by dowel-pins which enter holes in the ring, and the outer portions of the arms M are secured uponv the ring b2 by dowel-pins projecting from the under side of said arms.

The arm-patterns and the root of the arms are preferably formed hollow on the under side, so that the edges may fr t snugly down upon the follower-board, to lwhich they are removably secured by the pins, so that the different sizes or lengths of arms may be interchangeably used for molding different kinds of pulleys. The central ring b4 has also pins projecting down from it to enter holes in the inwardly-projecting flange b3, whichinsures the proper registration of the root with the outer portion of the pulley and arm patterns.

It will beseen that by changing the dif-` table, to accurately seat the half-liasks upon the table, while the portion above the cylindrical portion is cone-shaped to guide the pins to their seats.

I have shown in the drawings and described my invention as relating particularly to belt-pulleys, but it is obvious that a pattern for toothed gear-wheels may be substituted in place of the rim-pattern, the openin g in the follower-board being formed to per- Aseparate individual patterns.

mit the elevation or depression of a vcogged rim instead of a plain one.

The construction set forth has been found eminently successful in practice and free from those defects so common in machines of this class incident to lack of rigidity and protection of parts. Accurate mechanism working in molding-sand is working under the most unfavorable conditions, and failure in mechanism of an otherwise high character has resulted in machines of this class by reason of accuracy of adjustment and movement being defeated by the presence of sand in undesired places. One of the unfortunate conditions obtaining with molding-machines is that thel mechanism from which accurate results are desired must be located below the sand being dealt with. In my system of construction I combine rigidity with the perfection of protection of mechanism and accuracy of adjustment of movement.

The requirement of the present pulley art is for what may be called blended junctures or the avoidance of angles where arms join each other or join the rim or the hub. In outfitting a pulley-molding machine a satisfactory result can be arrived at by making the arm-pattern complete, as a spider accurately fllleted at the hub; but this wouldbe enormously expensive owing to the variety of relative hub sizes and arm sizes called for by the market. Hence the distinct advantage of making the major portion of the arms as The roots of the arms has a separate single spider-like structure, and the fillet at the hub has a separate ring fitting within the arm-root pattern and tting around the hub, each member being thus independently changeable. These sectional arm-patterns in my construction nd their support on the sectional followerboard described, one section of follower-board carrying the arm-root pattern and the llet-pattern, while the next outer section of the follower board unites and carries the separate arm-patterns, which also find support upon the next outer section of the follower-board. By this plan of construction a standardized system of arm-patterns can be permanently mounted, each side' upon a follower-board section, the set being put into the machine when desired. Similarly, follower-board'sections may be provided with standardized arm-root patterns adapted to receive various fillet-patterns to suit various standardized sizes of hubs. Under this system there may be produced, with a limited and economical system of patterns, a vast variety of accurately-molded and beautiful pulleys varying in size of rim, in section of arms, in number of arms, in size of hub, and character of arm-root, all of the junctures nicely blending.

It is also obvious that many mere mechanical changes may be made in the machine without departing from the spirit or scope of my invention, and hence IOO IIO

IVithout limiting myself to the precise details shown, what I claim as new, and desire to secure by Letters Patent, is-

l. In a pulley-molding machine, the combination, substantially as set forth, of a frame, an annular outer table-rim rigidly supported thereby and forming the margin of the follower-board, follower-board sections disposed within and on the plane of said table-rim, a rim-pattern arranged to slide vertically in the follower-board, a rim-carrier secured to the lower part of the rim-pattern below the follower-board, nuts secured to said carrier and projecting outwardly under said tablerim, vertical screw-shafts journaled in iixed bearings in the frame under said table-rim and engagingv said nuts, pinions fast on the y upper ends of said screw-shafts under said table-rim, an annular rack mounted in a bearing under said table-rim and engaging said pinions, and gearing mounted on the frame and engaging said annular rack and serving in turning said rack by hand.

2. In a pulley-moldin g machine, the combination, substantially as set forth, of a frame, an annular outer table-rim rigidly supported thereby and forming the margin of the follower-board, follower-board sections disposed within and on the plane of said table-rim, a rim-pattern arranged to slide vertically in the follower-board, a rim-carrier secured to the lower part of the rim-pattern below the follower-board, nuts secured to said carrier and projecting outwardly under said table-rim, vertical screw-shafts journaled in iixed bearings in the frame under said table-rim and engaging said nuts, pinions fast on the upper ends of said screw-shaf ts under said tablerim, an annular rack mounted in a bearing under said table-rim and engaging said pinions, gearing mounted on the frame and engagin g said annular rack and serving in turning said rack by hand, a hub or cylinder disposed centrally below the follower-board and rigidly united with said rim-carrier, a hubcarrier arranged to slide vertically in said hub or cylinder, a hub-pattern carried by said hub-carrier and projecting upwardly through the follower-board, and means for vertically adjusting said hub-carrier in said hub or cylinder.

3. In a pulley-molding machine, the combination, substantially as set forth, of a frame, an annular outer table-rim rigidly supported thereby and forming the margin of the follower-board, follower-board sections disposed within and on the plane of said table-rim, a rim-pattern arranged to slide verticallyin the follower-board, a rim-carrier secured to the lower part of the rim-pattern below the follower-board, nuts secured to said carrier and projecting outwardly under said table-rim, vertical screw-shafts journaled in fixed bearings in the frame under said table-rim and engaging said nuts, pinions fast on the upper ends of said screw-shafts under said tablerim, an annular rack mounted in a bearing under said table-rim and engaging said pinions, gearing mounted on the frame and engaging said annular rack and serving in turning said rack by hand, a slotted cylindrical column disposed below the follower-board and forming a Vertical guide for said rim-carrier and a support for sections of the followerboard, a hub or cylinder disposed within said column and having arms project-ing outwardly through the slots thereof into rigid engagement with said rim-carrier, a hub-carrier tted to slide vertically in said hub or cylinder, means for adjusting and locking said hub-carrier in said hub or cylinder, a hub-pattern carried by said hub-carrier and projecting upwardly through said followerboard, and removable follower-board sections supported by said column and encircling said hub-pattern.

4. The combination of the frame, the seotional follower-board through which the hub and rim patterns slide, a central support for the inner sections of the follower-board, the rim-pattern carrier, a guide for the hub-pattern carrier secured to the carrier forthe rimpattern, said guide and ri m-carrier being provided with shaft bearings, the transverse shaft iitted to revolve in said bearings, a pinion secured upon the inner end of said shaft, the hub-pattern carrier fitted within said central guide, a rack secured to the said carrier to mesh with the pinion upon the transverse shaft, a han d-wheel upon the end of the shaft to revolve the same for the purpose of actuating the hub-pattern carrier independently of the rim-carrier, and means such as shown to lock the hub-carrier, its guide and the rimcarrier together, substantially as shown and described.

5. In a pulley-molding machine, the combination, substantially as set forth, of a frame, a sectional follower-board supported thereon, rim and hub patterns adapted to slide through said sectional follower-board, carriers for said patterns rigidly connected together below said follower-board, vertical screw-shafts disposed below said follower-board and journaled at their upper ends in bearings in the top of said frame and at their lower ends in antifriotionbearings at the base of said frame, nuts engaging said screwshafts and rigidly connected with said carriers, pinions fast upon the upper ends of said screw-shafts, an annular rack engaging said pinions and journaled in an annular bearing supported by said frame, and gearing connected with said annular rack to serve in turning said rack by hand.

G. In a pulley-molding machine, the combination, substantially as set forth, of a sectional follower-board, arm-patterns on an intermediate section thereof, a hub pattern sliding through the cent-ral portion of the follower-board, an arm-root pattern secured to said central section of the followerboard around the hub and common to all of the arm-patterns, and a removable fillet-pattern IOG IIO

ring fitting around the exterior of the hubpattern and Within the interior of said armroot pattern and supported directly by said central follower-board section.

7. The hub-pattern, consisting of a hollow.

patterns, means for elevating and lowering said followers With their patterns secured thereon, the hub-pattern having a central tubular portion to receive a core for forming the bore of the hub, and the central support passing through the base of the hub pattern and follower to support said core, substanzo tially as shown and described.

JOHN E. DONQVAN.

Witnesses:

GEO. J. MURRAY, EMMA LYFORD. 

